These tracks have only been used a couple of times, and never even joined together. The come with the joiner and set of clamps that fit under the track making them flush The work with the majority of track saws including Festool, Makita, Evolution, and of course Wen. They do not work with the one oddball, Dewalt, which is what I switched to. https://www.amazon.ca/dp/B081KGLZBB?th=1 https://www.amazon.ca/dp/B07VDTQ212?th=1